Finding the Fourth Proportional to 2,039.64, 2,815.25 and 1,200.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,039.64 : 2,815.25 = 1,200.61 : x
2. Step 2: Convert to fraction form
   2,039.64/2,815.25 = 1,200.61/x
3. Step 3: Cross multiply
   2,039.64x = 2,815.25 × 1,200.61
4. Step 4: Simplify right side
   2,039.64x = 3,380,017.30
5. Step 5: Solve for x
   x = 3,380,017.30/2,039.64
6. Step 6: Final answer
   x = 1,657.16